ABAP Select data from SAP table REL28D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REL28D table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to REL28D. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the REL28D table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_REL28D TYPE STANDARD TABLE OF REL28D,
      WA_REL28D TYPE REL28D,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <REL28D> TYPE REL28D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REL28D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REL28D
  INTO TABLE IT_REL28D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REL28D
*  INTO TABLE @DATA(IT_REL28D2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_REL28D INDEX 1 INTO DATA(WA_REL28D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REL28D ASSIGNING <REL28D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REL28D>-TERMSCHL = 1.
<REL28D>-ABLEINH = 1.
<REL28D>-KUNDE = 1.
<REL28D>-VERTRAG = 1.
<REL28D>-ANLAGE = 1.

ENDLOOP.

LOOP AT IT_REL28D INTO WA_REL28D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REL28D-EQUNR, sy-vline,
  WA_REL28D-GERNR, sy-vline,
  WA_REL28D-ADAT, sy-vline,
  WA_REL28D-ISTABLART, sy-vline,
  WA_REL28D-ABLESTYP, sy-vline,
  WA_REL28D-ABLESER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REL28D you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_REL28D TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_REL28D INTO WA_REL28D.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field KUNDE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-KUNDE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-KUNDE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERTRAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-VERTRAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-VERTRAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLAGE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-ANLAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-ANLAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERNR
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-GERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-GERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VSTELLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-VSTELLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-VSTELLE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET_GELESEN
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-GERAET_GELESEN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-GERAET_GELESEN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ZWGRUPPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-ZWGRUPPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-ZWGRUPPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field HAUS
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_REL28D-HAUS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL28D-HAUS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_REL28D_STR, 
TERMSCHL TYPE STRING,
ABLEINH TYPE STRING,
KUNDE TYPE STRING,
VERTRAG TYPE STRING,
ANLAGE TYPE STRING,
EQUNR TYPE STRING,
GERNR TYPE STRING,
ADAT TYPE STRING,
ISTABLART TYPE STRING,
ABLESTYP TYPE STRING,
ABLESER TYPE STRING,
ABLESGR TYPE STRING,
ABLGR_ENT TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
ACTOR TYPE STRING,
ADATSOLL TYPE STRING,
ADAT_SUG TYPE STRING,
VSTELLE TYPE STRING,
BUPA_NAME TYPE STRING,
VBST_ADDR TYPE STRING,
VERT_VBEZ TYPE STRING,
GERAET_GELESEN TYPE STRING,
INFO_ICON TYPE STRING,
ZUORDDAT TYPE STRING,
ZUORDDATABR TYPE STRING,
MATNR TYPE STRING,
ZWGRUPPE TYPE STRING,
MATNR_NAME TYPE STRING,
ZWGRUPPE_NAME TYPE STRING,
HAUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REL28D_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_REL28D_STR-TERMSCHL sy-vline 
WA_REL28D_STR-ABLEINH sy-vline 
WA_REL28D_STR-KUNDE sy-vline 
WA_REL28D_STR-VERTRAG sy-vline 
WA_REL28D_STR-ANLAGE sy-vline 
WA_REL28D_STR-EQUNR sy-vline 
WA_REL28D_STR-GERNR sy-vline 
WA_REL28D_STR-ADAT sy-vline 
WA_REL28D_STR-ISTABLART sy-vline 
WA_REL28D_STR-ABLESTYP sy-vline 
WA_REL28D_STR-ABLESER sy-vline 
WA_REL28D_STR-ABLESGR sy-vline 
WA_REL28D_STR-ABLGR_ENT sy-vline 
WA_REL28D_STR-OTYPE sy-vline 
WA_REL28D_STR-OBJID sy-vline 
WA_REL28D_STR-ACTOR sy-vline 
WA_REL28D_STR-ADATSOLL sy-vline 
WA_REL28D_STR-ADAT_SUG sy-vline 
WA_REL28D_STR-VSTELLE sy-vline 
WA_REL28D_STR-BUPA_NAME sy-vline 
WA_REL28D_STR-VBST_ADDR sy-vline 
WA_REL28D_STR-VERT_VBEZ sy-vline 
WA_REL28D_STR-GERAET_GELESEN sy-vline 
WA_REL28D_STR-INFO_ICON sy-vline 
WA_REL28D_STR-ZUORDDAT sy-vline 
WA_REL28D_STR-ZUORDDATABR sy-vline 
WA_REL28D_STR-MATNR sy-vline 
WA_REL28D_STR-ZWGRUPPE sy-vline 
WA_REL28D_STR-MATNR_NAME sy-vline 
WA_REL28D_STR-ZWGRUPPE_NAME sy-vline 
WA_REL28D_STR-HAUS sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.